/*
 * The MIT License
 * 
 * Copyright (c) 2011 Takahiro Hashimoto
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.taobao.top.link.embedded.websocket.exception;

/**
 * WebSocket Exception class
 * 
 * WebSocket status code spec. (Draft06) 0 - 999 : Not used 1000 - 1999 :
 * reserved for WebSocket protocol 2000 - 2999 : reserved for WebSocket
 * Extentions 3000 - 3999 : reserved for Libraries and Frameworks(MAY) 4000 -
 * 4999 : reserved for Your Application(MAY)
 * 
 * @author t-hashimoto
 */
public class WebSocketException extends Exception {

  private static final long serialVersionUID = -1043043011439925850L;

  /** The status code. */
  private final ErrorCode   code;

  private String[]          formatArgs;

  /**
   * Instantiates a new web socket exception.
   *
   * @param code
   *          the error code
   */
  public WebSocketException(ErrorCode code) {
    super();
    this.code = code;
  }

  /**
   * Instantiates a new web socket exception.
   *
   * @param code
   *          the error code
   * @param formatArgs
   *          the format args for formatted error message
   */
  public WebSocketException(ErrorCode code, String... formatArgs) {
    super();
    this.code = code;
    this.formatArgs = formatArgs;
  }

  /**
   * Instantiates a new web socket exception.
   *
   * @param code
   *          the error code
   * @param cause
   *          the cause
   */
  public WebSocketException(ErrorCode code, Throwable cause) {
    super(cause);
    this.code = code;
  }

  /**
   * Instantiates a new web socket exception.
   *
   * @param code
   *          the error code
   * @param cause
   *          the cause
   * @param formatArgs
   *          the format args for formatted error message
   */
  public WebSocketException(ErrorCode code, Throwable cause, String... formatArgs) {
    super(cause);
    this.code = code;
    this.formatArgs = formatArgs;
  }

  /*
   * (non-Javadoc)
   * 
   * @see java.lang.Throwable#getMessage()
   */
  @Override
  public String getMessage() {
    int errorCode = getErrorCode();
    if (formatArgs != null) {
      return "[" + errorCode + "] " + String.format(code.getMessage(), (Object[]) formatArgs);
    } else {
      return "[" + errorCode + "] " + code.getMessage();
    }
  }

  /**
   * Gets the status code.
   *
   * @return the status code
   */
  public int getErrorCode() {
    int errorCode = Integer.valueOf(code.name().substring(1, 5));
    return errorCode;
  }
}
